UBUNTU-CVE-2021-4120

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    UBUNTU-CVE-2021-4120

    Published: 17 Feb 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-4120

    Summary:

    Details: snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

    References: https://ubuntu.com/security/CVE-2021-4120, https://ubuntu.com/security/notices/USN-5292-1, https://www.openwall.com/lists/oss-security/2022/02/18/2, https://github.com/snapcore/snapd/commit/f3f669d720ed8b0bcb73da7789843bf43b5c16cf, https://www.cve.org/CVERecord?id=CVE-2021-4120, https://ubuntu.com/security/notices/USN-5292-3, https://ubuntu.com/security/notices/USN-5292-2

    Affected packages

    Package

    Name: snapd

    Purl: pkg:deb/ubuntu/[email protected]+14.04~esm1?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.54.3+14.04~esm1

    Affected versions

    2.21~14.04.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-4120 | CVE-DB